— · Serum
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4.7
352 reviews
Rating breakdown
Most-mentioned keywords
Why consumers buy
Brand trust in COSRX
Many reviewers cite general trust in the COSRX brand and its skincare line as a reason for purchase, often mentioning they 'love the entire Cosrx line' or already use other COSRX products.
Peptide ingredient reputation
Consumers were drawn to the 6-peptide complex specifically, with several saying they wanted to try a 'peptide serum' after hearing about its efficacy for firmness and glow.
Influencer/YouTuber recommendation
A notable number of reviews (especially Korean and Japanese) mention purchasing after seeing YouTubers, bloggers, or dermatologists recommend the product.
Repurchase/loyalty
Many reviewers are on their 2nd, 3rd, or even multiple bottles, explicitly stating they stock up so they 'never run out,' showing strong repeat-purchase behavior.
Value for size/price
The large 150mL size combined with a low required dose per use (1-2 pumps) is frequently cited as offering good value and long-lasting supply.
How they use it
First step after cleansing
The most common usage pattern is applying it immediately after cleansing/washing the face, before toner or serum, as a 'booster' step.
Toner replacement
Skin concerns raised — and how the product addressed them
✓The vast majority of reviewers report the serum effectively hydrates and adds moisture, especially when used as a first step or toner substitute.
✓Mixed results: many sensitive-skin users find it soothing and non-irritating, but a notable subset experienced burning, redness, or reactions, suggesting inconsistent tolerance.
✓Several long-term users (3+ months) report pores appearing smaller and skin feeling firmer after consistent use.
Sentiment breakdown
Share of analyzed reviews by overall sentiment.
Many users substitute it directly for a toner due to its thin, watery consistency, applying it with hands or cotton pads before other products.
Layering with actives
Reviewers frequently layer it before or with Vitamin C, retinol, snail mucin, or other ampoules/serums, reporting it improves the absorption and effectiveness of these follow-up products.
Daily AM/PM frequency
Most use it once or twice daily, in the morning as a light prep step and/or at night after cleansing, with a few applying multiple layers for extra hydration.
Face and neck application
Some reviewers extend use beyond the face to the neck area, citing improvement in fine lines and skin texture there.
✓Reviewers frequently note a visible 'glow' or radiance after use, with the product credited for brightening and giving a healthy sheen.
✓Some reviewers, including those applying it to the neck, report improved firmness and reduced appearance of fine lines after weeks of use.
Concerns and outcomes summarized from reviews; percentages are approximate.
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